drop table student;

create table student (
	id number(5) primary key,
	cname varchar2(20),
	age number(3)
	);
	
create sequence john_seq02;

insert into student (id,cname,age)
values (john_seq02.nextval,'john',100);
insert into student (id,cname,age)
values (john_seq02.nextval,'tom',21);

select * from student;